Hi again.
Thank you for all of your replies. Carried out the test that MrSaffron suggested with the following results:

Faceplate on:
Downstream Connection Speed: 1002 kbps
Line Attenuation: 81db
Noise Margin: 6.4db

Faceplate off: 979 kbps
Line attenuation: 81.5db
Noise Margin: 6.6db

Using the faceplate-off results on the coolweb calculator indicated that we should be getting:

ADSL2: 500kbps to 1200kbps (current result: "Slightly Low")
ADSL2+: 1200 to 2400kbps (current result "Bad")

What should my next step be?

Xilo say there is no fault on the line and that the low speeds are entirely caused by the long line to the exchange.

The results from the coolweb calculator seem to be indicating there may be some other problems.....Any help very, very gratefully received....If we could get even close to 2000kbps we would be very happy indeed!

Thank you

Edited by deleted (Fri 20-Sep-13 18:14:03)

At 81dB you are outside the documented experience of ADSL, i.e. none of the theory or feedback from around the world gives data at those sorts of attenuations.

81dB, does suggest a line of 8km length, so if that fits with the knowledge of village the exchange is in then, sorry but that is all you will get from ADSL.

Booking the SFI was a waste, unless you had very good reason to be believe the line was in reality a lot shorter.

2000 Kbps - no chance. For those speeds its find a fixed wireless provider, satellite or another alt-net, or wait for your counties BDUK project to deliver.

In reply to a post by MrSaffron:

At 81dB you are outside the documented experience of ADSL,
...
2000 Kbps - no chance.

In which case don't you need to fix your calculator at these attenuations?

It deceptively gives ranges variously as:

• 300Kbps to 2033Kbps
• 500Kbps to 2200Kbps
• 1200Kbps to 2400Kbps

EDIT: Just sussed out these are the 63dB attn. ranges, misrepresented as those for 81dB. All the more misleading!

Booking the SFI was a waste

by the ISP who should be paying for it.

Edited by XRaySpeX (Fri 20-Sep-13 22:21:51)

Yes boss

OK! Seen my edit?

I hope you see this as constructive criticism or peer review.

ok good to hear your side of things matt thanls.

I dont know what I would do in this situation but I wouldnt be happy, to me the howler by BT on the estimate.

Andrew - from which table are you getting a predicted 800kb at 8km? All the graphs I have seen show it 'fizzling out' by 6km.

In reply to a post by mikejp:

Andrew - from which table are you getting a predicted 800kb at 8km? All the graphs I have seen show it 'fizzling out' by 6km.

depends on the wire diameter. 6 km certainly isn't a limit.

From the small amount of real data on lines that long.

Record seems to be around 11km

I ask because the BTOR engineer said 9km was out of the question. None of the 'accepted' ADSL line length graphs I have seen (4) seem to agree with you. Would you like to include this in your "real data on lines that long"?